如何将大型精灵png切割成较小的UIImages？ [英] How to cut a large sprite png into smaller UIImages?

问题描述

例如，png文件是1200（h）x 50（w）像素，我如何剪切 png并加载6 UIImage s，每个200（h）x 50（w）。谢谢！

For example, the png file is 1200 (h) x 50 (w) pixels, how can I cut the png and loads in 6 UIImages, each 200 (h) x 50 (w). Thanks!

编辑 - 感谢Michal的回答，最终代码：

EDIT - thanks to Michal's answer, the final code:

 CGImageRef imageToSplit = [UIImage imageNamed:@"huge.png"].CGImage;
 CGImageRef partOfImageAsCG = CGImageCreateWithImageInRect(imageToSplit, CGRectMake(0, 0, 50, 50));

 UIImage *partOfImage = [UIImage imageWithCGImage:partOfImageAsCG]; 
 // ...

 CGImageRelease(partOfImageAsCG);

推荐答案

查看CGImageCreateWithImageInRect函数。它适用于CGImage，但很容易在那个和UIImage之间进行转换。

Look at CGImageCreateWithImageInRect function. It works with CGImage, but it's easy to convert between that one and UIImage.

这是一个例子（从内存中输入，可能无法编译）：

Here's an example (typed from memory, might not compile):

CGImageRef imageToSplit = [UIImage imageNamed:@"huge.png"].CGImage;
CGImageRef partOfImageAsCG = CGImageCreateWithImageInRect(imageToSplit, CGRectMake(0, 0, 200, 50));
CGRelease(imageToSplit);
UIImage *partOfImage = [UIImage imageWithCGImage:partOfImageAsCG];
CGImageRelease(partOfImageAsCG);

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